Malicious PDF — malware analysis report

Static analysis result for SHA-256 a927b194df9c3d69…

MALICIOUS

PDF

92.8 KB Created: 2021-08-18 08:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efb78be057542cd0c3260376db6e17f5 SHA-1: 3281bbbbde7da1bb4baf6a4b0803905f029ccaf7 SHA-256: a927b194df9c3d695d66561bf9e8f27469eec1a5d3310d59752f9a96871b742f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a tactic to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gioiacompany.net/images/upload/file/wusin.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6850a9579---86626459398.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3732064917.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/urtt5d7i5ti0svgrpqihhbu6i5/79902191217.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6be6bdda912b6e6cd54a492e5acecda2/lexedetodexuzosozu.pdfIn PDF document text
    • http://614move.com/clients/4890/File/gezoru.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/rokinibej.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835d6ae7143---13541002163.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fazuwizijusofodadigasegof.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/58dgp6kb8scdaj9na14jf5lcfr/wezusami.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210806_FCCCF93922F0A3A3.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/48845401126.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610037c8bde8a---71939748397.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/54754201880.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/22374003353.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/64567450001.pdfIn PDF document text
    • http://strandedtattoo.net/file/60597662335.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e0f56479a---buvipafuwaxum.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tjr7ju79shqv3fgpr03efkcr66/44381383185.pdfIn PDF document text
    • https://aitalk.vn/upload/files/25557120893.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d485d62e51c---vosalixakutofusawagid.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d0d75a5e3a98fd8958699b34350c35e2/lamibagow.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/7731321088.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/jifamefa.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/34631252274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sample+scholarship+donation+request+letterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 16728 bytes
SHA-256: 910818aaabb97123469bf6909aca8199119569f07b218983ec053c9f53640ccc
font_01_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14908 11100 bytes
SHA-256: ae544d006f527dca3145812d1af18ab83755b076fe1869cea327da2b65953daa